Download LASIK - LV Prasad Eye Institute

Flap complications: Sometimes the anterior corneal
flap that is made in LASIK may not be complete. In such
situations the flap is repositioned and surgery may be reattempted after three months. In rare instances, the flap may
tear or become detached.
If there is an emergency at night, during a weekend, or
on a holiday, come for emergency care to the Institute.
Always mention the patient’s ID number, name and the
doctor’s name in all communications.
Corneal ecstasia: This can occur if the corneal thickness
is less to begin with, or if the cornea is thinned more than it
can withstand. Persons with low corneal thickness are not
suitable for LASIK. Other serious complications like corneal
infections, corneal edema, corneal perforation, etc., though
possible, are extremely rare.
So that all may see
L V Prasad Eye Institute
LASIK
Important!
Although LASIK is an excellent procedure for low and
moderate refractive errors, it may not totally dispense with
the need for glasses in everybody. Though doctors strive to
make the refractive error zero, this is not always possible.
The main purpose of surgery is to offer sufficient good vision
so that patients are not dependent upon glasses most of
the time. A detailed eye examination, followed by a realistic
discussion with the surgeon on the expected outcome of
surgery, will help you to know what to expect.
Alternatives to LASIK
R efractive Laser Surgery
So that all may see
L V Prasad Eye Institute
Hyderabad
Patients who are unsuitable for LASIK can opt for
alternatives such as photorefractive keratectomy (PRK),
phakic intraocular lens implant, and clear lens extraction
(refractive lens exchange) with negative intraocular lens
implantation.
Kallam Anji Reddy Campus
L V Prasad Marg, Banjara Hills, Hyderabad 500034
Tel: 91 40 39892020 / 30612108; Fax: 91 40 23548339
Emergency Services: 91 40 30612100
Email: [email protected], [email protected]
Phakic IOL is recommended for patients with very high
refractive powers, or those with very low corneal thickness or
flat corneas who are unsuitable for LASIK. In this procedure
an intraocular lens (made of biocompatible material that
has been tested and proven fit for implantation for over 50
years) is fixed in front of the natural clear lens. Three types of
lenses are used: anterior chamber, iris fixated, and posterior
chamber. The quality of vision is usually very good in patients
after phakic IOLs, as compared to those with LASIK.
Patia, Bhubaneswar 751024, Orissa
Tel: 91 0674 3987999; Fax: 91 0674 3987130
Emergency Services: 91 0674 3987220
Email: [email protected], [email protected]
In phakic IOL the lens is implanted inside the eye and
cannot be felt. Unlike other implant procedures or lasers,
this implanted lens can be removed any time, as the surgery
does not affect the important natural structures of the eye.
Therefore, the entire procedure is reversible.
Bhubaneswar
Visakhapatnam
GMR Varalakshmi Campus
Door No: 11-113/1, Hanumanthawaka Junction
Visakhapatnam 530040
Tel: 91 0891 3984555 / 984666; Fax: 91 0891 3984444
Email: [email protected]
Vijayawada
Kode Venkatadri Chowdary Campus
Tadigadapa Village, Penamaluru Mandal
Vijayawada 521137
Tel: 91 0866 306 2020
Email: [email protected]
Website: www.lvpei.org
© January 2015/ LVPEI
Vision correction surgery with
LASIK and Wavefront
Lasers have proved especially useful in eye care, where they
are also used to correct refractive errors, thus minimizing
or eliminating the need for glasses or contact lenses.
Ophthalmologists at L V Prasad Eye Institute (LVPEI) have
an international reputation for performing laser refractive
surgery or Laser-Assisted In-Situ Keratomileusis (LASIK)
with extremely successful outcomes.
The procedure also minimizes the occurrence of new
aberrations, which lead to night vision problems like haloes,
glare and ghost images. This leads to more accurate vision
correction and better night vision, along with reduced glare
and enhanced contrast sensitivity.
LVPEI also offers Wavefront assisted vision correction
technology, which scores over other procedures for vision
correction in several ways. This procedure not only helps
correct common vision defects such as myopia, hyperopia,
and astigmatism (cylindrical vision), it is also capable
of measuring and correcting even minute aberrations in
the eye, giving results that were, until now, considered
impossible.
In general, LASIK is recommended for patients with mild
to moderate degree of myopia. More caution needs to be
exercised while operating on patients with hyperopia. It is
relatively easier to flatten the cornea (in myopia), but it is
more difficult to steepen the cornea (in hyperopia). Making
the cornea too steep may lead to a gradual regression of
the power and a risk of the patient losing the best corrected
vision. If the refractive error is high, in young patients contact
lenses are preferable to surgery. For patients above the age
of 40, refractive lens exchange (along with the removal of
the clear lens) with a regular monofocal/multifocal lens is
recommended.
What are refractive errors
Who is suitable for LASIK
The eye functions like a camera. Light rays entering the eye
are focused by the cornea and the lens of the eye onto the
light sensitive retina at the back of the eye, which is like the
film of a camera. The retina then transmits a clear image,
or photo, to the brain. In people with refractive errors like
myopia (nearsightedness) and hyperopia (farsightedness),
the light rays are not focused properly and blurred images
are formed. These can be measured as aberration patterns.
Plano and Wavefront assisted customised
LASIK surgery
In addition to spectacles and contact lenses for vision
correction, LASIK surgery is now a widely accepted
procedure. This is an advanced laser vision correction
technique for correcting myopia, hyperopia, and astigmatism.
In LASIK the curvature of the cornea is reshaped using a
laser that removes tissues with precision of up to a micron
level.
Wavefront assisted customized LASIK is a cutting edge laser
vision correction technique where a spot laser also removes
tiny aberrations in the eye, that may occur after conventional
(or Plano) LASIK, thus improving the outcome of the surgery.
Surgeons use an instrument called the aberrometer to
measure minute imperfections in the eye, which are then
corrected during surgery. While older lasers only correct
the spherical and cylindrical power, the aberrometer can
measure many more types of aberrations and correct them.
vision will fade out. You will start seeing the light again after
the suction ring is removed. The whole procedure will be
over in a few minutes. There is usually no pain.
After laser surgery
After surgery your eye will be covered with a shield and you
can return home. You may have some pain for the first 24 to
36 hours, for which the doctor will prescribe oral analgesics.
You will have to come for follow-up visits from the very next
day onwards. Please be careful and follow the schedule
suggested by the doctor.
The usual check-up schedule is:
 First check-up on the morning after surgery
 Seven days after surgery
 One month after surgery
 Three months after surgery
 One year after surgery
When will you know the result
Persons who opt for LASIK are those who find spectacles
visually unacceptable, those who are intolerant to lenses,
those who would like to participate in outdoor sports or
people interested in professions demanding excellent
uncorrected vision. Prospective patients should be above
18 years of age and their spectacles’ power should have
been unchanged for at least a year. Further, they should not
have any ocular surface abnormality such as dry eyes. Most
importantly, the cornea should have adequate thickness for
it to be operated upon.
You will undergo special diagnostic tests on each visit to
assess your visual acuity. Your vision will become clear
within a few days. Sometimes you may require another
session of laser treatment, especially if you have a high
degree of refractive error. This is done after three months.
Before the laser procedure
Undercorrection/overcorrection: Undercorrection may
sometimes be planned intentionally or may occur as an
unintentional effect. As a result, the eye may remain shortsighted. If the degree of residual myopia is significant, you
may be treated again later. Overcorrection occurs very
rarely.
The patient undergoes a complete eye examination, in which
the structure and functioning of the eyes are checked. An
Orbscan is done to ascertain the thickness and curvature
of the cornea. This also helps in ruling out keratoconus,
a progressive thinning disorder of the cornea, which is a
contraindication for LASIK. The ophthalmologist studies the
test reports before making a final decision, in consultation
with the patient.
During surgery
At LVPEI laser surgery is done on an out-patient basis; this
means you go home immediately after surgery. Usually one
eye is treated at a time. The procedure is performed under
topical anesthesia. You will be made to lie down on a couch
and asked to look up at the microscope where you will see
a blinking green light. When the suction ring is applied, your
Possible side effects
Laser surgery is very safe and effective. But some patients
may have side effects. Your doctor will discuss these with
you and clear your doubts before surgery. Some possible
side effects are:
Glare/halo effect: You may feel some sensitivity to light at
night or in bright sunlight. Sometimes in dim light, you may
see a faded ghost image around the sharp bright image.
This will pass after the first few days or weeks.
Decrease in contrast sensitivity: Some people find that
their night vision has become a bit dull. This happens
because of a decrease in their ability to discriminate between
different contrast levels. The Wavefront assisted procedure
minimizes night vision problems since minute imperfections
and aberrations are also taken care of.